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    Subject[patch 1/3] libata: check for AN support
    Check to see if an ATAPI device supports Asynchronous Notification.
    If so, enable it.

    Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>

    Index: 2.6-mm/drivers/ata/libata-core.c
    ===================================================================
    --- 2.6-mm.orig/drivers/ata/libata-core.c
    +++ 2.6-mm/drivers/ata/libata-core.c
    @@ -71,6 +71,7 @@ const unsigned long sata_deb_timing_long
    static unsigned int ata_dev_init_params(struct ata_device *dev,
    u16 heads, u16 sectors);
    static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
    +static unsigned int ata_dev_set_AN(struct ata_device *dev);
    static void ata_dev_xfermask(struct ata_device *dev);

    static unsigned int ata_print_id = 1;
    @@ -1745,6 +1746,23 @@ int ata_dev_configure(struct ata_device
    }
    dev->cdb_len = (unsigned int) rc;

    + /*
    + * check to see if this ATAPI device supports
    + * Asynchronous Notification
    + */
    + if (ata_id_has_AN(id))
    + {
    + /* issue SET feature command to turn this on */
    + rc = ata_dev_set_AN(dev);
    + if (rc) {
    + ata_dev_printk(dev, KERN_ERR,
    + "unable to set AN\n");
    + rc = -EINVAL;
    + goto err_out_nosup;
    + }
    + dev->flags |= ATA_DFLAG_AN;
    + }
    +
    if (ata_id_cdb_intr(dev->id)) {
    dev->flags |= ATA_DFLAG_CDB_INTR;
    cdb_intr_string = ", CDB intr";
    @@ -3642,6 +3660,42 @@ static unsigned int ata_dev_set_xfermode
    }

    /**
    + * ata_dev_set_AN - Issue SET FEATURES - SATA FEATURES
    + * with sector count set to indicate
    + * Asynchronous Notification feature
    + * @dev: Device to which command will be sent
    + *
    + * Issue SET FEATURES - SATA FEATURES command to device @dev
    + * on port @ap.
    + *
    + * LOCKING:
    + * PCI/etc. bus probe sem.
    + *
    + * RETURNS:
    + * 0 on success, AC_ERR_* mask otherwise.
    + */
    +static unsigned int ata_dev_set_AN(struct ata_device *dev)
    +{
    + struct ata_taskfile tf;
    + unsigned int err_mask;
    +
    + /* set up set-features taskfile */
    + DPRINTK("set features - SATA features\n");
    +
    + ata_tf_init(dev, &tf);
    + tf.command = ATA_CMD_SET_FEATURES;
    + tf.feature = SETFEATURES_SATA_ENABLE;
    + tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
    + tf.protocol = ATA_PROT_NODATA;
    + tf.nsect = SATA_AN;
    +
    + err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
    +
    + DPRINTK("EXIT, err_mask=%x\n", err_mask);
    + return err_mask;
    +}
    +
    +/**
    * ata_dev_init_params - Issue INIT DEV PARAMS command
    * @dev: Device to which command will be sent
    * @heads: Number of heads (taskfile parameter)
    Index: 2.6-mm/include/linux/ata.h
    ===================================================================
    --- 2.6-mm.orig/include/linux/ata.h
    +++ 2.6-mm/include/linux/ata.h
    @@ -193,6 +193,12 @@ enum {
    SETFEATURES_WC_ON = 0x02, /* Enable write cache */
    SETFEATURES_WC_OFF = 0x82, /* Disable write cache */

    + SETFEATURES_SATA_ENABLE = 0x10, /* Enable use of SATA feature */
    + SETFEATURES_SATA_DISABLE = 0x90, /* Disable use of SATA feature */
    +
    + /* SETFEATURE Sector counts for SATA features */
    + SATA_AN = 0x05, /* Asynchronous Notification */
    +
    /* ATAPI stuff */
    ATAPI_PKT_DMA = (1 << 0),
    ATAPI_DMADIR = (1 << 2), /* ATAPI data dir:
    @@ -298,6 +304,8 @@ struct ata_taskfile {
    #define ata_id_queue_depth(id) (((id)[75] & 0x1f) + 1)
    #define ata_id_removeable(id) ((id)[0] & (1 << 7))
    #define ata_id_has_dword_io(id) ((id)[50] & (1 << 0))
    +#define ata_id_has_AN(id) \
    + ((id[76] && (~id[76])) & ((id)[78] & (1 << 5)))
    #define ata_id_iordy_disable(id) ((id)[49] & (1 << 10))
    #define ata_id_has_iordy(id) ((id)[49] & (1 << 9))
    #define ata_id_u32(id,n) \
    Index: 2.6-mm/include/linux/libata.h
    ===================================================================
    --- 2.6-mm.orig/include/linux/libata.h
    +++ 2.6-mm/include/linux/libata.h
    @@ -136,6 +136,7 @@ enum {
    ATA_DFLAG_CDB_INTR = (1 << 2), /* device asserts INTRQ when ready for CDB */
    ATA_DFLAG_NCQ = (1 << 3), /* device supports NCQ */
    ATA_DFLAG_FLUSH_EXT = (1 << 4), /* do FLUSH_EXT instead of FLUSH */
    + ATA_DFLAG_AN = (1 << 5), /* device supports Async notification */
    ATA_DFLAG_CFG_MASK = (1 << 8) - 1,

    ATA_DFLAG_PIO = (1 << 8), /* device limited to PIO mode */
    --
    -
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